export class Body {
    private content: string='';
    private constructor(content: string) {
        this.content = content;
    }
    static from(raw_text: string): Body|null{
        if (raw_text === null) {
            return null;
        }else{
            return new Body(raw_text); 
        }
    }
    public to_string(): string {
        return this.content;
    }
}